Polling stations opened at 6 a.m. local time on Tuesday, November 3, in many East Coast states of the United States, for the midterm elections.
The U.S. president hopes to retain control of the Senate, on which his room for maneuver for the remainder of his term depends.
Voters are also called on to elect sheriffs and governors or to decide locally on various issues.
Voters are called on to renew the entire House of Representatives as well as one-third of the Senate.
Republicans currently hold the majority in Congress, in both the Senate and the House of Representatives.
The results could be decided in a few key states that are being particularly closely watched.
A sign of the stakes, nearly 58 million citizens have already voted early, a record for midterm elections.
These elections will shape the rest of Donald Trump's presidency ahead of the 2028 presidential election.
The billionaire's approval rating is at its lowest, with only 37.5% positive opinions, according to the New York Times poll aggregator.